revlog: break up compression of large deltas
Python's zlib apparently makes an internal copy of strings passed to
compress(). To avoid this, compress strings 1M at a time, then join
them at the end if the result would be smaller than the original.
For initial commits of large but compressible files, this cuts peak
memory usage nearly in half.
#!/bin/sh
# This runs with TZ="GMT"
hg init
echo "test-parse-date" > a
hg add a
hg ci -d "2006-02-01 13:00:30" -m "rev 0"
echo "hi!" >> a
hg ci -d "2006-02-01 13:00:30 -0500" -m "rev 1"
hg tag -d "2006-04-15 13:30" "Hi"
hg backout --merge -d "2006-04-15 13:30 +0200" -m "rev 3" 1
hg ci -d "1150000000 14400" -m "rev 4 (merge)"
echo "fail" >> a
hg ci -d "should fail" -m "fail"
hg ci -d "100000000000000000 1400" -m "fail"
hg ci -d "100000 1400000" -m "fail"
# Check with local timezone other than GMT and with DST
TZ="PST+8PDT"
export TZ
# PST=UTC-8 / PDT=UTC-7
hg debugrebuildstate
echo "a" > a
hg ci -d "2006-07-15 13:30" -m "summer@UTC-7"
hg debugrebuildstate
echo "b" > a
hg ci -d "2006-07-15 13:30 +0500" -m "summer@UTC+5"
hg debugrebuildstate
echo "c" > a
hg ci -d "2006-01-15 13:30" -m "winter@UTC-8"
hg debugrebuildstate
echo "d" > a
hg ci -d "2006-01-15 13:30 +0500" -m "winter@UTC+5"
hg log --template '{date|date}\n'